Pulmonary Rehab Calculator

Exercise prescription from 6MWT, IBW, A-a gradient, and tidal volume targets.

Age (years)

Height (cm)

Weight (kg)

Sex (0=Male, 1=Female)

6MWT Distance (meters)

PaO2 (mmHg)

PaCO2 (mmHg)

Tab to move between fields

Ideal Body Weight (kg)

65.9

Predicted 6MWT (m)520

6MWT % Predicted67.4%

Moderate Exercise Speed (km/h)2.3

Tidal Volume Target Low (mL)396

Tidal Volume Target High (mL)527

A-a Gradient (mmHg)24.7

Normal A-a Gradient (mmHg)20.3

Low Intensity Kph1.58

High Intensity Kph2.89

How to Use This Calculator

Enter age (years), height (cm), weight (kg), and sex to calculate ideal body weight.
Enter your 6MWT distance (meters) from a supervised 6-minute walk test.
Review predicted 6MWT based on your demographics and your percentage of predicted distance.
Check recommended moderate and vigorous exercise heart rate targets for rehab sessions.
Use exercise speed recommendations to set treadmill pace during pulmonary rehabilitation.

How the result changes with Height (cm)

Age (years): Patient age in years.
Height (cm): Patient height in centimeters.
Weight (kg): Patient body weight in kilograms.
Sex (0=Male, 1=Female): Biological sex for predicted values.
6MWT Distance (meters): Distance walked during the 6-minute walk test.
PaO2 (mmHg): Arterial partial pressure of oxygen from ABG (for A-a gradient).
PaCO2 (mmHg): Arterial partial pressure of CO2 from ABG.

Ideal Body Weight (kg): Ideal body weight from Devine formula — used for ventilator tidal volume targets.
Predicted 6MWT (m): Expected 6-minute walk distance for a healthy person (Enright & Sherrill).
6MWT % Predicted: Actual 6MWT distance as percentage of predicted.
Moderate Exercise Speed (km/h): Recommended moderate-intensity walking speed (~65% of 6MWT speed).
Tidal Volume Target Low (mL): Lower target tidal volume at 6 mL/kg IBW (ARDSnet protective ventilation).
Tidal Volume Target High (mL): Upper target tidal volume at 8 mL/kg IBW.
A-a Gradient (mmHg): Alveolar-arterial oxygen gradient on room air. Elevated = gas exchange impairment.
Normal A-a Gradient (mmHg): Expected normal A-a gradient for this age ≈ (age/4) + 4.

Identify Input Parameters
4 parameters
Age (years) = 65, Height (cm) = 170, Weight (kg) = 75, Sex (0=Male, 1=Female) = 0 = 7 input(s) provided
Calculate Ideal Body Weight
65.9 = 65.9
Calculate Predicted 6MWT
Predicted 6MWT
520 = 520
Calculate 6MWT % Predicted
6MWT % Predicted = (walkDistance6MWT / predicted6MWT) * 100
67.4 = 67.4